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Question

In the given figure a ball strikes a rod at its end elastically and rod is hinged smoothly at point A. Then which of the statement(s) is/are correct (regarding just before and after the collision)


  1. Linear momentum of system (ball + rod) is not conserved

  2. Angular momentum of system (ball + rod) about hinged point A is conserved

  3. Kinetic energy of ball is conserved

  4. Linear momentum of ball is conserved


Solution

The correct options are
A

Linear momentum of system (ball + rod) is not conserved


B

Angular momentum of system (ball + rod) about hinged point A is conserved


Angular momentum of system is conserved about A as torque about A is zero. Linear momentum is not conserved as there is an impulse applied at A.

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